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  SEAWAY and other Software


SEAWAY is a huge frequency-domain ship motions PC program based on the linear strip theory to calculate the wave-induced loads, motions, added resistance and internal loads for six degrees of freedom of displacement ships and yachts, barges, semi-submersibles or catamarans, sailing in regular and irregular waves. The program is suitable for deep water as well as for very shallow water. Viscous roll damping, bilge keels, anti-roll tanks and linear springs can be added.
Work of acknowledged hydromechanic scientists (like Ursell, Tasai, Kaplan, Frank, Keil, Newman, Gerritsma, Faltinsen, Fukuda, Ikeda, etc.) has been used, when developing this comprehensive but very robust code in the late 80's and early 90's.
Relevant reports on this computer code can be found here in the next section.
As an example of its capabilities, a few comparisons of experimental data of a fast cargo ship model with SEAWAY results have been presented below.

     

Over 60 national and international regular users were using the DOS version of this PC strip theory program, developed as a somewhat derailed scientific hobby. In total, I have spent almost 10,000 hours on its development and description.

Concerning my retirement in April 2006, this extensive computer program had been transferred to the much younger hydromechanic Dr. Ir. Leon Adegeest of the maritime consultancy AMARCON in Dalfsen, the Netherlands. This consultancy aims to serve the maritime industry with high-quality seakeeping and wave load analyses in a broad context, see website www.amarcon.com. Their approach in solving complex seakeeping-related problems is using state-of-the-art software in combination with engineering judgement. Program SEAWAY was a valuable supplement to their OCTOPUS solftware, see its history.
Amarcon provides state of the art solutions to optimize routing and decision support for all types of sea-going vessels. Amarcon is the creator of OCTOPUS, a suite of hardware and software products that form a unique combination for improving safety/efficiency and cutting down costs in the maritime industry. Amarcon implements the best solution for your requirements, off-the-shelf, or tailor designed.
OCTOPUS includes:
- Fuel/performance monitoring and advice
- Motion & performance monitoring
- Weather windows for efficient ship operations
- Dynamic Positioning capability forecast
- Heavy weather decision support
Information about this successor of SEAWAY is given in OCTOPUS-Office, a leaflet of this hydrodynamic analysis program.

Please, don't contact me anymore for information about SEAWAY. Mail your questions directly to Leon.Adegeest@amarcon.com.



Also a selection of some DOS computer programs in the field of ship and offshore hydromechanics, which can be downloaded freely, will be given here:

  • LeSq.zip   (size: 43 kB, updated: 03-04-2000)
    This zip-file contains a Least Squares program (LeSq.exe) for obtaining polynomials up to the fourth degree through maximal 450 points, a short description of the input data (LeSq.doc), an example of an input data file (LeSq.inp) and an example of an output data file (LeSq.out).

  • ProPol.zip   (size: 890 kB, updated: 20-04-2000)
    This zip-file contains a program for calculating propeller characteristics (ProPol.exe), a short description of the input data (ProPol.doc), an example of an input data file (ProPol.inp) and an example of an output data file (ProPol.out).
    The program calculates the open water thrust and torque characteristics of a full-scale fixed-pitch Wageningen B-Series propeller, based on polynomials given by M.W.C. Oosterveld and P. van Oossanen in 1975. Also, the program calculates - for each rpm - the thrust and torque coefficients of a third degree polynomial, expressed in the speed ratio J.
    A copy of the report of Oosterveld and van Oossanen is given here too.

  • Holtrop.zip   (size: 1228 kB, updated: 21-04-2000)
    This zip-file contains a program for calculating the still water resistance of a ship according to the 1984 method of J. Holtrop (Holtrop.exe), copies of reports, a short description of the input data (Holtrop.doc), an example of an input data file (Holtrop.inp) and an example of an output data file (Holtrop.out).

  • IsherCof.zip   (size: 1283 kB, updated: 21-04-2000)
    This zip-file contains a program for calculating the wind resistance coefficients of a ship according to the 1973 method of R.M. Isherwood (IsherCof.exe), a copy of the report of Isherwood, a short description of the input and output data (IsherCof.doc), an example of an input data file (IsherCof.inp) and an example of an output data file (IsherCof.out).

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